Frost crystals on autumn leaves - hoar frost

It's chilly outside but the yellow autumn leaves of the silver birch trees are still hanging on the graceful pendulous branches.
Silver birch tries are the last that lose their leaves in late autumn.

Shiny frost crystals are rushing the leaves to let go.
The color of the leaves turn brown becoming more intense after sharp frosts.

I like to watch the feathery hoar frost crystals, covering the rusty leaves in the morning on the tree in front of my window.